An editor menu window automatically closes when I select an option on it.

I’m using Unity on Linux, with the awesome window manager. (Sprite Editor → Slice → Type)
I’ve been having an issue with the drop down menu in the Slice menu of the Sprite Editor.
When I click Slice in the Sprite Editor a small window opens with some options.
One of these is Type, which opens a dropdown menu from which I can select the type of slicing.

The problem I’ve been having is that as soon as I press the Type button the Slice window closes.

I believe this is due to the fact that said window auto closes when the mouse moves out of it, and when the drop down menu shows up it moves the focus away from the window, closing it.

Is there some option I can turn to disable the automatic closing of menus when the mouse moves out of them?

Here is the issue tracker: Unity Issue Tracker - Selection pop-up windows are not focused when opened

It says:

Reproducible with: 2019.3.5f1, 2019.3.14f1

Not reproducible with: 2017.4.40f1, 2018.4.23f1, 2019.3.4f1, 2020.1.0b9, 2020.2.0a11

For 2019.4 the status says: Planned.

Until then, I am using 2019.3.14 which can be downloaded from the Unity Archive

If you need the 2019.4 version explicitly you can create a new project with the working version, and either move/copy the files to do changes (don’t forget the .meta files), or symlink the Assets folder of the non working main project to the working temporary project, this way you can have them both opened and switch only when you need to.